Hello, i just got a new helmet for my collection and i know or think it is a Curassierhelmet or Jager zu Pferde helmet but i'm not really sure what regiment and what exactly i do have here as i never have seen the Prussian eagle without wording and i never have seen a metal helmet with the horse hair plum thingy (can i restore the hair and if yes what color should it have, maybe someone has a picture with a helmet and plume), inside is stamped Otto Nachtigall Berlin 1911 or 1914 - can't make out the last number of the date